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Release notes for GXemul 0.3.2 |
Release notes for Gavare's eXperimental Emulator (GXemul), 0.4.1 |
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Copyright (C) 2003-2005 Anders Gavare. |
Copyright (C) 2003-2006 Anders Gavare. |
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GXemul is an experimental instruction-level machine emulator. It can be |
GXemul is an experimental instruction-level machine emulator. Several |
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used to run binary code for (among others) MIPS-based machines. Several |
emulation modes are available. In some modes, processors and surrounding |
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emulation modes are available. For some emulation modes, processors and |
hardware components are emulated well enough to let unmodified operating |
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surrounding hardware components are emulated well enough to let unmodified |
systems (e.g. NetBSD) run as if they were running on a real machine. |
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operating systems run as if they were running on a real machine. |
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I have verified that the following "guest" operating systems can run |
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inside the emulator: |
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Guest operating system Emulated machine |
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NetBSD/pmax 2.0 (and 1.6.2) DECstation 5000/200 |
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OpenBSD/pmax 2.8-BETA DECstation 5000/200 |
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Ultrix 4.2-4.5 DECstation 5000/200 |
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Sprite demo harddisk image DECstation 5000/200 |
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Debian GNU/Linux for DECstation DECstation 5000/200 |
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Redhat Linux 7.1 for mips DECstation 5000/200 |
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NetBSD/arc 1.6.2 Acer PICA-61 |
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OpenBSD/arc 2.3 Acer PICA-61 |
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NetBSD/hpcmips 2.0 NEC MobilePro 770, 780, 800, 880 |
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NetBSD/cobalt 2.0 Cobalt |
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A couple of other emulation modes exist. Some of these modes are almost |
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working well enough to run complete guest operating systems, but most are |
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just skeletons. The modes that work are listed in the documentation. |
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The emulator can also be used in other experiments; it does not have to |
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run entire guest operating systems. It is important to remember, though, |
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that GXemul does not simulate things smaller than an instruction; this |
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means that pipe-line stalls, penalties caused by branch-prediction misses, |
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and other effects are not simulated. |
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The most important/visible changes from 0.3.1 to 0.3.2 are: |
The documentation lists the machines and guest operating systems that can |
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be regarded as "working" in GXemul. The best working guest operating |
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systems are probably NetBSD/pmax, NetBSD/cats, and OpenBSD/cats. |
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x) NetBSD/cobalt can run from a harddisk image. (Installation |
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must be done using another OS though, for example NetBSD/pmax.) |
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x) Some minor fixes to make the binary translation system a bit |
Changes between release 0.4.0.1 and 0.4.1 include, among other things: |
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more stable. |
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o) Some bugs in the dynamic translation core have been fixed, making |
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all emulation modes (especially the MIPS mode) more stable. |
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o) In the refactoring effort between 0.4.0 and 0.4.0.1, single-stepping |
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(and instruction tracing) of 64-bit programs was accidentally broken. |
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Single-stepping in 64-bit mode could result in strange exceptions. |
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This has been fixed in 0.4.1. |
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o) MIPS emulation performance has been improved somewhat: |
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R3000: After removing some buggy code (hints for physical page |
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translations), it was possible to remove the workaround for R3000 |
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caches which was needed in 0.4.0.1 to make Linux and Ultrix run. |
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This gives an overall speedup for R2000/R3000. |
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For non-R3000, there have been some speedups as well. After fixing |
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reference count bugs for 64-bit addressing in the dyntrans system, |
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workarounds/hacks in the tlbwr/tlbwi instructions and in the ASID |
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change helper function could be removed. |
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o) A new -s command line option is now available, for dumping |
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raw runtime data/statistics on every instruction to a file. |
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Currently, the following kinds of data can be dumped: |
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1. the program counter (virtual address) |
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2. the physical address representation of the program counter |
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3. the internal dyntrans instruction call pointer, useful when |
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developing/optimizing the emulator |
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This data can then be analyzed by external tools. |
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(There was a -s command line option in previous releases of |
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the emulator, but it did not work as intended, and was not |
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usable from dyntrans emulation modes.) |
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Please read the HISTORY files for more details. |
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Files included in this release are: |
Files included in this release are: |
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BUGS A list of known bugs. |
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HISTORY Detailed revision history / changelog. |
HISTORY Detailed revision history / changelog. |
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LICENSE Copyright message / license. |
LICENSE Copyright message / license. |
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README Quick start instructions, for the impatient. |
README Quick start instructions, for the impatient. |
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RELEASE This file. |
RELEASE This file. |
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TODO TODO notes. |
TODO TODO notes. |
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configure, Makefile.skel sh and make scripts for building GXemul. |
configure, Makefile.skel sh and make scripts for building GXemul. |
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demos Tutorial-like demos of testmachine functionality. |
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doc Documentation. |
doc Documentation. |
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experiments Experimental code. (Usually not needed.) |
experiments Experimental code. (Usually not needed.) |
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src Source code. |
src Source code. |
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tests Regression tests. |
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To build the emulator, run the ./configure script, and then run make. |
To build the emulator, run the configure script, and then run make. This |
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should work on most Unix-like systems. |
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Building the emulator should work on most Unix-like systems. (One system which |
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is specifically known to NOT work is Ultrix/RISC inside the emulator; Ultrix |
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chokes on the configure script and the default cc in Ultrix doesn't work.) |
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Regarding files in the src/include/ directory: only some of these are written |
Regarding files in the src/include/ directory: only some of these are written |
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by me, the rest are from other sources (such as NetBSD). The license text says |
by me, the rest are from other sources (such as NetBSD). The license text says |
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This product includes software developed by Marc Horowitz. |
This product includes software developed by Marc Horowitz. |
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This product includes software developed by Brini. |
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This product includes software developed by Mark Brinicombe |
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for the NetBSD Project. |
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This product includes software developed by TooLs GmbH. |
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This product includes software developed by Manuel Bouyer. |
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This product includes software developed by the Alice Group. |
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This product includes software developed by Ichiro FUKUHARA. |
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Also, src/include/alpha_rpb.h requires the following: |
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Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. |
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All rights reserved. |
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Author: Keith Bostic, Chris G. Demetriou |
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Permission to use, copy, modify and distribute this software and |
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its documentation is hereby granted, provided that both the copyright |
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notice and this permission notice appear in all copies of the |
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software, derivative works or modified versions, and any portions |
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thereof, and that both notices appear in supporting documentation. |
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See individual files for license details, if you plan to redistribute GXemul |
See individual files for license details, if you plan to redistribute GXemul |
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or reuse code. |
or reuse code. |
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Thanks to everyone who has provided me with feedback. |
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Thanks to (in no specific order) Joachim Buss, Olivier Houchard, Juli Mallett, |
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Juan Romero Pardines, Alec Voropay, Göran Weinholt, Alexander Yurchenko, and |
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everyone else who has provided me with feedback. |
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If you have found GXemul useful in some way, or feel like sending me comments |
If you have found GXemul useful in some way, or feel like sending me comments |
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or feedback in general, then mail me at anders(at)gavare.se. |
or feedback in general, then mail me at anders(at)gavare.se. |
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